Error in search retweets

I saw a method that has given the id of a tweett he returns the amount of retwet, but when I try to run the method does not work. I wonder if someone could help me find the error. If so I can send the project to the email.

I can't get to this right away, but let me try to point you in the right direction. Anytime you see the "Exception has been thrown by the target of an invocation", you'll know that this exception is wrapping another. There is an exception
chain that you can follow by lookin at the InnerException. Keep following the InnerException properties until you find an exception with information that makes sense. Look at all the properties of the exception to find out what is happening.
If you find a TwitterQueryException, be sure to look at the Response property to see the message. Also, look at the HttpError property in case it has something of interest.

So the API must be wrong or outdated, because I only managed to solve the problem because of the code presented in the following post:
http://linqtotwitter.codeplex.com/Thread/View.aspx?ThreadId=210941